<!--电梯导航-->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    body {
      font-family: Arial, sans-serif;
    }
    .elevator {
      position: fixed;
      top: 50%;
      left: 10px;
      transform: translateY(-50%);
      background-color: #f8f8f8;
      border-radius: 5px;
      box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    }
    .elevator ul {
      list-style-type: none;
      padding: 10px;
    }
    .elevator li {
      margin: 5px 0;
    }
    .elevator a {
      text-decoration: none;
      color: #333;
      padding: 10px;
      display: block;
    }
    .elevator a:hover {
      background-color: #ddd;
    }
  </style>
</head>
<body>
<div>
  <div class="elevator">
    <ul>
      <li><a href="#section1">Section 1</a></li>
      <li><a href="#section2">Section 2</a></li>
      <li><a href="#section3">Section 3</a></li>
      <li><a href="#section4">Section 4</a></li>
    </ul>
  </div>

  <div id="section1" style="height: 800px; background-color: lightblue;">
    Section 1
  </div>
  <div id="section2" style="height: 800px; background-color: lightgreen;">
    Section 2
  </div>
  <div id="section3" style="height: 800px; background-color: lightcoral;">
    Section 3
  </div>
  <div id="section4" style="height: 800px; background-color: lightgoldenrodyellow;">
    Section 4
  </div>
</div>
</body>
</html>